It's part of the ritual of big sporting events. In the run-up, there's always a bit of worry about whether all the venues will be ready in time. But in Brazil, which is hosting this year's World Cup soccer tournament, that worry is more like an anxiety attack right now. And since I'm planning to travel to Brazil for the World Cup this summer, I'm feeling some of that anxiety too.

Brazil's been hit with protests recently, and police are prepared for that. But when the World Cup and Olympics come to town, the problem won't be street protests, but rather the possibility of terrorism. Brazilian security forces are gearing up, so they're ready.

As Brazil gets ready to host the Olympics and World Cup, the country won't just be dealing with threats from civil unrest. There's also the threat of terrorism. The World's Jason Margolis has more on that angle from Rio de Janeiro.

The sports stadium in Rio de Janeiro that is to host track and field events at the 2016 Olympic Games was abruptly closed down Thursday due to potentially dangerous structural design flaws in its roof.

It's part of the ritual of big sporting events. In the run-up, there's always a bit of worry about whether all the venues will be ready in time. But in Brazil, which is hosting this year's World Cup soccer tournament, that worry is more like an anxiety attack right now. And since I'm planning to travel to Brazil for the World Cup this summer, I'm feeling some of that anxiety too.

As Brazil gets ready to host the Olympics and World Cup, the country won't just be dealing with threats from civil unrest. There's also the threat of terrorism. The World's Jason Margolis has more on that angle from Rio de Janeiro.

The sports stadium in Rio de Janeiro that is to host track and field events at the 2016 Olympic Games was abruptly closed down Thursday due to potentially dangerous structural design flaws in its roof.

Brazil's been hit with protests recently, and police are prepared for that. But when the World Cup and Olympics come to town, the problem won't be street protests, but rather the possibility of terrorism. Brazilian security forces are gearing up, so they're ready.

It's part of the ritual of big sporting events. In the run-up, there's always a bit of worry about whether all the venues will be ready in time. But in Brazil, which is hosting this year's World Cup soccer tournament, that worry is more like an anxiety attack right now. And since I'm planning to travel to Brazil for the World Cup this summer, I'm feeling some of that anxiety too.

As Brazil gets ready to host the Olympics and World Cup, the country won't just be dealing with threats from civil unrest. There's also the threat of terrorism. The World's Jason Margolis has more on that angle from Rio de Janeiro.

The sports stadium in Rio de Janeiro that is to host track and field events at the 2016 Olympic Games was abruptly closed down Thursday due to potentially dangerous structural design flaws in its roof.

Brazil's been hit with protests recently, and police are prepared for that. But when the World Cup and Olympics come to town, the problem won't be street protests, but rather the possibility of terrorism. Brazilian security forces are gearing up, so they're ready.

It's part of the ritual of big sporting events. In the run-up, there's always a bit of worry about whether all the venues will be ready in time. But in Brazil, which is hosting this year's World Cup soccer tournament, that worry is more like an anxiety attack right now. And since I'm planning to travel to Brazil for the World Cup this summer, I'm feeling some of that anxiety too.